½ or 1 Karshapana - Mauryan Dynasty - 2 silver coins for identification

I think these are punchmarked Karshapana but I am trying to find more information about them

Indrec177
½ or 1 Karshapana - Mauryan Dynasty
Magadh - Mauryan Silver Punch Marked Coin (321 BC to 185 BCE)
Metal: Silver
Weight: 3.26
Size: 16.14
Rectangle (irregular)
Thickness: 1.78



Indrec178
½ or 1 Karshapana - Mauryan Dynasty
Magadh - Mauryan Silver Punch Marked Coin (321 BC to 185 BCE)
Metal: silver
Weight: 3.25
Size: 17.25
Thickness: 1.68
Round (irregular)